99 lines
1.9 KiB
C
99 lines
1.9 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* include/asm/irqflags.h
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*
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* IRQ flags handling
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*
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* This file gets included from lowlevel asm headers too, to provide
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* wrapped versions of the local_irq_*() APIs, based on the
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* arch_local_irq_*() functions from the lowlevel headers.
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*/
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#ifndef _ASM_IRQFLAGS_H
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#define _ASM_IRQFLAGS_H
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#include <asm/pil.h>
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#ifndef __ASSEMBLY__
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static inline notrace unsigned long arch_local_save_flags(void)
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{
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unsigned long flags;
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__asm__ __volatile__(
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"rdpr %%pil, %0"
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: "=r" (flags)
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);
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return flags;
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}
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static inline notrace void arch_local_irq_restore(unsigned long flags)
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{
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__asm__ __volatile__(
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"wrpr %0, %%pil"
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: /* no output */
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: "r" (flags)
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: "memory"
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);
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}
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static inline notrace void arch_local_irq_disable(void)
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{
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__asm__ __volatile__(
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"wrpr %0, %%pil"
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: /* no outputs */
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: "i" (PIL_NORMAL_MAX)
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: "memory"
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);
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}
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static inline notrace void arch_local_irq_enable(void)
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{
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__asm__ __volatile__(
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"wrpr 0, %%pil"
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: /* no outputs */
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: /* no inputs */
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: "memory"
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);
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}
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static inline notrace int arch_irqs_disabled_flags(unsigned long flags)
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{
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return (flags > 0);
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}
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static inline notrace int arch_irqs_disabled(void)
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{
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return arch_irqs_disabled_flags(arch_local_save_flags());
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}
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static inline notrace unsigned long arch_local_irq_save(void)
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{
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unsigned long flags, tmp;
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/* Disable interrupts to PIL_NORMAL_MAX unless we already
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* are using PIL_NMI, in which case PIL_NMI is retained.
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*
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* The only values we ever program into the %pil are 0,
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* PIL_NORMAL_MAX and PIL_NMI.
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*
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* Since PIL_NMI is the largest %pil value and all bits are
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* set in it (0xf), it doesn't matter what PIL_NORMAL_MAX
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* actually is.
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*/
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__asm__ __volatile__(
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"rdpr %%pil, %0\n\t"
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"or %0, %2, %1\n\t"
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"wrpr %1, 0x0, %%pil"
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: "=r" (flags), "=r" (tmp)
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: "i" (PIL_NORMAL_MAX)
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: "memory"
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);
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return flags;
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}
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#endif /* (__ASSEMBLY__) */
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#endif /* !(_ASM_IRQFLAGS_H) */
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